Holder for carbon brushes of commutators



(No Model.)

0. H. FARRINGTON. HGLDER FOR CARBON BRUSHES OF OOMMUTATORS.

Patented July 14,1891.

INVENTOR- Md? Wwwzsszs.

M 4;, aw.

sumcw UNITED STATES PATENT OFFICE.

CLARENCE I-I. FARRINGTON, OF MILFORD, MASSACIIUSE'WPS.

HOLDER FOR CARBON BRUSHES OF COMMUTATORS.

SPECIFICATION forming part of Letters Patent No. 455,856, dated July 14,1891.

Application filed October 21, 1890. Serial No. 368,858. (No model.)

To all whom it may concern.-

Be it known that I, CLARENCE H. FARRING- TON, a citizen of the UnitedStates of America, and a resident of Milford, in the county of Worcesterand State of Massachusetts, have invented certain new and usefulImprovements in Holders for Carbon Brushes of Commutators, of which thefollowing is a full, clear, and exact description.

This improved holder for carbon brushes is designed for electric motorsand generators.

The holder of this invention,in substance, is composed of two armshinged end to end together, and one arm suitable, as well known, to befixed as desired and the other arm free to be swung on said fixed arm,in combination with means held on said swinging arm and constructed andadapted to receive and hold the brush and to enable it to be forcedendwise and with an elastic and yielding pressure into contact with thecommutator of the motor or generator, and means held on said arms tofasten them to and unfasten them from each other, and all otherwise,substantially as hereinafter described, and pointed out in the claims.

I11 the drawings forming part of this specification, Figure 1 is a planview of the holder. Fig. 2 is a side elevation; and Fig. 3 is alongitudinal vertical section of the same on line 3 3, Fig. 1.

In the drawings, A and B are the two arms of the holder, and C is thebutt-hinge, having a detachable central pintle C hinging together saidarms end to end, and when the arm A is fixed in position as desired, thearm B is free to be swung on it, turning about the pintle C of thebutt-hinge of the two arms.

D is the carbon brush. (Shown as a rectangular-shaped block.) This brushD extends through a way B and projects at its opposite end portions fromopposite sides of the swinging arm B. The brush D in use at oneprojecting end D is in contact with the commutator E of the motor orgenerator, and at the other end D it is in contact with and is pressedupon by a block F, which has springarms F 1 arranged to press againstthe brush D at its opposite side faces D D and also a screw-threaded rodG, which at one end is engaged with and turns in but is confined againstlengthwise movement through it, and

at its opposite end has a milled wheel G This screw-rod, between its twoends, engages a screw-threaded nut II at the middle portion of a crossbar or head H which atits opposite end portions is made fast to rods .I,that are parallel with each other and with the lengthwise direction andmovement of the brush and extend each through separate tubes J 2 J whichare parallel with each other and said rods and are held on the swingingarm B at its side toward said cross bar or head H Each tube contains aspring K, coiled about its rod and confined lengthwise on the rodbetween ahead J of the rod at its end opposite to that to which it isfastened and a shoulder J at the end of the tube J 2 toward thecross-head. The tubes J 2 J 2 guide the block F in its travel back andforth. The central butt of the hinge of the two arms A l3, and which ison the swinging arm B, has a series of parallel peripheral longitudinalteeth and notches a for the engagement of the edge I) of a disk L, whichis fixed on and eccentric to the axis of the pintle L arranged to turnin suitable bearings at the hinged end of the fixed arm A, and thereincon fined against accidental escape by the interlock of said butt withsaid pintle, which for that purpose has a lengthwise peripheralconcavity M, Fig. 3.

L is a handle to turn the eccentricallymounted disk L, and thereby tobring its edge into position to engage or to be placed out of engagementwith the teeth and notches a of the hinge-butt. With the disk L inengagement with the hinge-butt of the swinging arm 13 said arm isfastened against movement in a direction toward said disk, and with thedisk out of said engagement said arm is released for movement in thedirection stated. In the first instance the swinging arm is madestationary, so as to act as a resistant on a turn of the screw-rod H ina direction to place and force and hold the brush into contact with thecommutator E and with a pressure which is elastic and yielding from thethen action of the springs K, confined and arranged as aforesaidrelative to said screw-rod and guiderods J and tubes J In the secondinstance the swinging arm is set free, and so the brush can beimmediately placed and held out of contact with the commutator withoutdisturbin the adjustment of its said spring-pressure thereon, and also,if desired, the brush and arm B can be entirely swung out of position.(Dotted lines, Fig. 2.) lVith the brush out of contact, as stated, theside spring-arms I I bearing thereon hold it against accidental cscape.

Having thus described my invention, what I claim, and desire to secureby Letters Patent,

1. In an electric generator or motor, the combination of a swinging armB, held on an arm A, suitably fixed, means held on said swinging arm toreceive and hold the brush and to secure an adjustable and yielding orelastic pressure thereof in contact with a commutator, the sameconsisting of the way 3 of swinging arm B, the block F, screw-tln'eadedrod G, engaging and free to turn in said block, a screw-n ut ll, engagedby said screw-rod and held on a cross-head H headed parallel rods J',held on said cross-head, shouldered tubes J receiving said rods andfixed to swinging arm 1-3, and coiled springs K about said rods .I andconfined endwise thereon between their heads and the heads of saidtubes, and means to fasten and unfasten said swinging arm to and fromsaid fixed arm, substantially as described, tor the purposes specified.

2. In an electric generator or motor, the combination of a swinging armB,held on an arm A, suitably fixed, means held on said swinging arm toreceive and hold the brush and to secure an adjustable and yielding orelastic pressure thereof in contact with a commutator, and means tofasten and unfasten said swinging arm to and from said fixed arm,consisting of teeth and notches on the swinging arm l3 and an eccentricdisk mounted on the fixed arm and adapted to be engaged with anddisengaged from said teeth and notches, substantially as described, forthe purposes specified.

3. In an electric generator or motor, the

combination of a swinging arm B, held on an arm A, suitably fixed, meansheld on said swinging arm to receive and hold the brush and to secure anadj nstable and yielding or elastic pressure thereof in contact with acommutator, and means to fasten and unfasten said swinging arm to andfrom said fixed arm, consisting of teeth and notches on the swinging armI and an eccentric disk hung by a pintle L turning in suitable bearingsof the fixed arm and adapted to be engaged laterally by the butt of thehinge connection of the arms, which is on the swinging arm 1"),substantially as described, for the purposes specified.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

CLARENCE ll.

Witnesses:

ALBERT W. BnowN,

Fnanons M. known.

